SCREW EXTRACTOR #2 EO2A | eBaydiy Tools

Left hand spiral fluted extractor bit for use after drilling a hole to remove broken bolts, studs, screws and lugs
Use with reversible drill to drill into fastener, then extractor drives itself into drilled hole to remove broken fastener without damaging threads
Use with 7/64\” left hand drill bit HDCLM7A on fastener threads 5/32\”-7/32\”